Indlela Yokwenza Izinsimbi Ze-Alloy Zezingxenye Zomshini
Ama-alloy ayizinto ezisetshenziswa kakhulu ekwakhiweni kwezingxenye zomshini ngoba ahlanganisa izakhiwo eziphakeme ezingatholakali ezinsimbini ezihlanzekile. Ngokuhlanganisa izinto ezimbili noma ngaphezulu—isibonelo, insimbi nekhabhoni, i-chromium, i-nickel, i-molybdenum, noma i-vanadium—singafinyelela amandla akhulayo okudonseka, ukumelana nokuguguleka, ukumelana nokugqwala, ukuqina, ngisho nokuqina emazingeni okushisa aphezulu. Embonini yemishini, ikhwalithi ye-alloy inquma kakhulu impilo yesevisi yezingxenye ezifana nama-shaft, amagiya, ama-bearings, iziphethu, amantongomane nama-bolts, amabhlogo enjini, kanye nezingxenye ezahlukahlukene ezisebenza ngaphansi kwemithwalo enamandla. Ngakho-ke, inqubo yokwenza ama-alloy kumele yenziwe ngaphansi kokulawulwa okuqinile, kusukela ekukhetheni izinto kuya ekuhlolweni kokugcina.
1. Nquma izidingo zengxenye yomshini
Isinyathelo sokuqala ngaphambi kokudala i-alloy ukuqonda umsebenzi wengxenye yomshini ezokhiqizwa. Ingxenye ngayinye inezidingo ezahlukene zempahla yezinto ezibonakalayo. Amagiya adinga ubulukhuni obuphezulu bendawo kanye ne-ductile core ukuze amelane nokushaqeka. Ama-shaft adinga ukuqina okuphezulu kanye nokumelana nokukhathala. Izingxenye ezindaweni ezigqwalisayo, njengephampu zamakhemikhali noma izinjini zasolwandle, zidinga ukumelana okuhle nokugqwala. Ngokusekelwe kulezi zidingo, onjiniyela bezinto zokwakha banquma izakhiwo eziqondiwe: amandla okudonsa (UTS), amandla okukhiqiza, ubulukhuni, ukuqina komthelela, ukuqina, ukumelana nokuguguleka, kanye nokumelana nokugqwala noma nokushisa okuphezulu.
Uma izakhiwo eziqondiwe sezisunguliwe, kukhethwa uhlobo lwe-alloy olufanele, njengensimbi yekhabhoni, insimbi ene-alloy ephansi, insimbi engagqwali, i-alloy yensimbi ecijile, i-alloy ye-aluminium, noma i-alloy yethusi. Lokhu kukhetha kubheka nezindleko zokukhiqiza, ukutholakala kwezinto zokusetshenziswa, ukucutshungulwa kalula, kanye nezindinganiso zemboni ezisebenzayo.
2. Ukukhetha ukwakheka kwe-alloy
Ukwakheka kwe-alloy “indlela yokupheka” eyinhloko enquma isakhiwo esincane sento kanye nezakhiwo zemishini. Isibonelo esivame kakhulu insimbi, i-alloy yensimbi (Fe) kanye ne-carbon (C). I-carbon yandisa ubulukhuni namandla, kodwa inani elikhulu linganciphisa ukuqina. Ukwengezwa kwe-chromium (Cr) kungathuthukisa ukugqwala nokuqina, kuyilapho i-nickel (Ni) ithuthukisa ukuqina nokumelana nokuqhekeka. I-Molybdenum (Mo) ithuthukisa ukumelana nokushisa okuphezulu futhi yandisa amandla, kuyilapho i-vanadium (V) ilungisa usayizi wokusanhlamvu futhi ithuthukisa ukumelana nokuguguleka.
Embonini, ukwakheka kwe-alloy kuvame ukunamathela ezindinganisweni ezifana ne-ASTM, JIS, DIN, noma i-SNI ukuqinisekisa ikhwalithi ehambisanayo. Isibonelo, amagiya avame ukusebenzisa izinsimbi ze-alloy ezifana ne-SCM (Cr-Mo), ezifanele ukwelashwa kokushisa. Ezindaweni ezigqwalayo, izinsimbi ezingagqwali ezifana nohlobo 304 noma 316 (eziqukethe i-Cr ne-Ni, kanye ne-316, i-Mo iyengezwa).
3. Lungisa izinto zokusetshenziswa kanye nokulawula ikhwalithi yokuqala
Izinto zokusetshenziswa zokuhlanganisa zingafaka izinsimbi ezihlanzekile, ama-ferroalloy (isb., i-ferrochrome, i-ferromanganese), kanye nezingcezu ezihlungiwe. Izingcezu zisetshenziswa kabanzi ngenxa yokusebenza kahle kwezindleko, kodwa kumele zilawulwe ngokuqinile ngoba zingaqukatha ukungcola okufana ne-sulfur (S), i-phosphorus (P), noma ezinye izinto ezingafuneki. Okuqukethwe okuphezulu kwe-sulfur ne-phosphorus kungabangela ukuthi izinto zibe buthaka, ziqhekeke kakhulu, futhi zinciphise ukumelana nokukhathala.
Ngaphambi kokuncibilika, kwenziwa ukuhlolwa kwezinto zokusetshenziswa: ukuhlunga ngohlobo, ukususa uwoyela/ukugqwala okweqile, kanye nokuhlolwa kokwakheka kusetshenziswa izindlela ezifana ne-Optical Emission Spectroscopy (OES). Lokhu kulawula kubalulekile ukuze kunqunywe ngokunembile ukwakheka kokugcina kwe-alloy.
4. Inqubo yokuncibilikisa kanye nokwenza i-alloy
Isigaba esiyinhloko sokwenza izinsimbi zensimbi ukuncibilikisa nokuxuba izakhi esithandweni somlilo. Izinhlobo ezivamile zama-oven zifaka:
1. Isithando Somlilo Sokungenisa: Sifanelekela ama-alloy anokulawulwa okunembile kokwakheka kanye nokuhlanzeka okuhle kwensimbi. Sisetshenziswa kabanzi kuma-alloy ensimbi kanye nama-alloy angenayo i-ferrous.
2. Isithando Somlilo Se-Electric Arc (EAF): Sivame kakhulu ezimbonini ezinkulu zensimbi, esikwazi ukuncibilikisa izinsalela eziningi.
3. I-Blast Furnace kanye ne-converter (BOF): Ngokuvamile isetshenziselwa ukukhiqizwa kwensimbi nensimbi ngobuningi, ikakhulukazi kusuka ku-ore.
Ekuncibilikeni, izinto zifakwa ngezigaba. Uma insimbi encibilikisiwe isifinyelelwe, izinto ezixubile ziyangezwa ngokwezibalo. Izinto ezengeziwe kumele ziqaphele: ezinye izinto ziyashintshashintsha noma zisabela nomoya-mpilo, ngakho-ke ukuhleleka nesikhathi sokwengeza kuthinta kakhulu imiphumela. I-Manganese (Mn), isibonelo, ivame ukungezwa ukusiza "ukubopha" isibabule, kuyilapho i-aluminium (Al) ivame ukusetshenziselwa ukususa i-oxidation (ukunciphisa umoya-mpilo oncibilikisiwe) ukuvimbela ukwakheka kwama-porosity kanye nezinto eziyingozi ezifakiwe.
5. Ukuhluzwa kwensimbi ewuketshezi: ukususwa koketshezi emzimbeni, ukususwa kwesibabule, kanye nokususwa kwegesi
Ukuze izingxenye zenjini ziqine futhi zithembeke, insimbi encibilikisiwe kumele "ihlanzeke." Ukungcola okufana nomoya-mpilo, i-hydrogen, i-nitrogen, i-sulfur, kanye nokufakwa okungeyona insimbi kungabangela imifantu futhi kunciphise ukumelana nokukhathala.
Ezinye izindlela zokuhlanza zihlanganisa:
– Ukususa i-oxidation: Ukwengeza i-Al, i-Si, noma i-Mn ukubopha i-oxygen.
– Ukususa i-sulfurization: Ukunciphisa i-sulfur ngokufaka i-lime (CaO2) bese kwakheka i-slag ekwazi ukuheha i-sulfur.
– Ukususa igesi nge-vacuum: Ukususa amagesi ancibilikisiwe (ikakhulukazi i-hydrogen ne-nitrogen) ngenqubo ye-vacuum, ebalulekile ngensimbi yekhwalithi ephezulu yezingxenye ezibalulekile njengemishayo ye-turbine noma amagiya ane-voltage ephezulu.
– Ukucwenga ama-slag: Ama-slag adlala indima ekubambeni ukungcola. Ukulawula ukwakheka kwama-slag (i-lime, i-fluorspar, i-alumina) kunquma ukusebenza kahle kokucwenga.
6. Ukuthulula kanye nokwakheka kokuqala (ukubumba)
Uma ukwakheka kwensimbi encibilikisiwe kanye nobumsulwa bayo sekufinyelele imigomo, isigaba esilandelayo ukwenziwa kwensimbi. Kunezindlela ezimbili eziyinhloko:
1. Ukuthungwa kwe-Ingot: Insimbi encibilikisiwe ithululelwa esikhumbeni esikhulu, bese i-ingot icutshungulwa ngokuyibumba noma ukuyigoqa. Le ndlela ivame kakhulu ezingxenyeni ezidinga isakhiwo esiqinile kanye nezakhiwo eziphezulu zemishini.
2. Ukuphonswa okuqhubekayo: Insimbi encibilikisiwe ithululwa njalo ezinhlakeni, eziqhakazayo, noma ezitsheni. Le ndlela iyasebenza ekukhiqizweni ngobuningi kanye nekhwalithi eqhubekayo.
Ukulawula izinga lokushisa kubalulekile ekutheleni. Izinga lokushisa eliphezulu kakhulu lingandisa i-oxidation; izinga lokushisa eliphansi kakhulu lingabangela ukuphambuka (insimbi ayigcwalisi ngokuphelele isikhunta). Ngaphezu kwalokho, ukwakheka kwesiteshi sokuthela kanye nesikhuphukeli kuthinta ukugoba kokuncipha kanye nokuhlukaniswa kwezinto.
7. Izinqubo zokwakha: ukwakha, ukugoqa, kanye nomshini wokuqala
Izingxenye eziningi zomshini zenziwa ngezinqubo zokwakha ipulasitiki ukuze kuthuthukiswe isakhiwo sezinto. Ukwakha, isibonelo, kungandisa amandla nokuqina ngokuhlanza okusanhlamvu nokuqondisa ukugeleza kokusanhlamvu ukuze kulandele ukuma kwengxenye. Ukugoqa kuvame ukusetshenziselwa ukwakha izinduku, amapuleti, noma amaphrofayili.
Ngemva kokwakheka, izingxenye zivame ukushintshwa kokuqala (ukushintshwa okuqinile) ukuze kutholakale ukuma okusondele kusayizi wokugcina, okushiya ithuba lokwelashwa kokushisa kanye nezinqubo zokuqeda.
8. Ukwelashwa ngokushisa ukuze kufezwe izakhiwo ezifiselekayo
Ama-alloy ezingxenye zomshini cishe njalo adinga ukwelashwa ngokushisa ukuze kufezwe izakhiwo ezinhle kakhulu. Ezinye izindlela zokwelapha ngokushisa ezivamile zifaka:
– Ukunamathisela: Kuthambisa impahla, kunciphisa ukucindezeleka okusele, kuthuthukisa ukuqina kwayo.
– Ukulungisa: Kulungisa isakhiwo esincane, kuthuthukise ukufana kanye namandla uma kuqhathaniswa nokuqinisa.
– Ukucima nokulungisa: Ukucima (ukupholisa okusheshayo) kwandisa ubulukhuni, bese ukupholisa kunciphisa ukuphuka futhi kulinganisela amandla nokuqina.
– Ukushiswa kwe-carburizing/nitriding: Ukwelashwa kokuqina kwendawo yamagiya nezingxenye zokungqubuzana. Ukushiswa kwe-carburizing kwengeza ikhabhoni endaweni; ukushiswa kwe-nitriding kwengeza i-nitrogen ukuze kukhiqizwe ungqimba oluqinile nolungagugi.
Ukukhethwa kwamapharamitha—izinga lokushisa, isikhathi sokubamba, kanye nendawo yokupholisa (amanzi, uwoyela, i-polymer, igesi)—kunomthelela omkhulu ebulukhunini bokugcina, ukuphambuka, kanye nengozi yokuqhekeka.
9. Ukuqeda, ukuhlola nokuhlola
Isigaba sokugcina ukuqeda kanye nokulawula ikhwalithi. Ukuqeda kungafaka phakathi ukukhanda ngokunemba, ukugaya, ukupholisha, kanye nokumboza, uma kudingeka. Ngemva kwalokho, kwenziwa ukuhlolwa ukuqinisekisa ukuthi izinto zihlangabezana nezimfuneko:
– Ukuhlolwa kokwakheka kwamakhemikhali (i-OES noma i-XRF).
– Ukuhlolwa kokuqina (Rockwell, Brinell, Vickers).
– Ukuhlolwa kokuqiniswa kanye nokuthinteka (i-Charpy).
- Ukuhlolwa kwe-Metallographic ukubona isakhiwo esincane, usayizi wezinhlamvu, kanye nezinto ezifakiwe.
– I-NDT (Ukuhlolwa Okungabhubhisi) njengokuhlolwa kwe-ultrasonic, izinhlayiya zamagnetic, i-dye penetrant ukuthola amaphutha ngaphandle kokulimaza izingxenye.
- Ukuhlolwa kokukhathala kwezingxenye ezithwalwa yimithwalo ye-cyclic.
Uma kutholakala ukungafani, kuthathwa isinyathelo sokulungisa: ukulungiswa kokwakheka, ukulungiswa kokwelashwa kokushisa, noma ukuthuthukiswa kwenqubo yokuthulula nokwakha.
Isiphetho
Ukukhiqizwa kwama-alloy ezingxenye zomshini kuwuchungechunge lwezinqubo ezihlobene: kusukela ekunqumeni izakhiwo zezinto ezidingekayo, ukukhetha ukwakheka, ukuncibilikisa nokucwenga, ukuphotha, ukwakha, ukwelashwa kokushisa, kanye nokuhlolwa kokugcina. Isihluthulelo sempumelelo sisekulawuleni ukwakheka nokuhlanzeka kwensimbi, kanye nokuphathwa kwenqubo enembile ukuqinisekisa ukuthi isakhiwo esincane esitholakalayo sihlangabezana nezidingo zengxenye. Ngenqubo ehlelekile nesekelwe ezindinganisweni, ama-alloy angakhiqiza izingxenye zomshini eziqinile, ezihlala isikhathi eside, futhi eziphephile ukusetshenziswa ezinhlotsheni ezahlukene zezimboni.
Uma ungathanda, ngingahlela lesi sihloko ukuze siqonde kakhudlwana—isibonelo, ukugxila ezinsimbini ze-gear alloy, izinsimbi ze-aluminium zezimoto, noma izinsimbi ezingagqwali zezingxenye zephampu—ezinezibonelo zokwakheka kanye nemidwebo yokugeleza kwenqubo.
